LOAD-LIMITING SEATBELT RETRACTOR

A restraint system includes a retractor housing; a spool rotatably coupled to the retractor housing and defining an axis of rotation; a torsion bar elongated along the axis of rotation and positioned coaxially in the spool; a cylinder elongated along the axis of rotation, extending coaxially around the torsion bar, and positioned coaxially in the spool; and a cutter fixed to the spool, the cutter including a cutting edge engaging the cylinder.